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The webservers link with you has been inactive or have you have not had any interaction with it for the past 15 minutes. If there is still no interaction with the server (within the next 5 minutes) then your "live session" will expire.

When joining up a Bench Top ensure that you allow yourself enough uninterrupted time, as you can't have distractions when you start the process as the glue starts setting pretty quickly, however in saying that, provided you are prepared you will have no problems.